Method of making watch backs and bezels.



G. F. EBERHARD.

METHOD OF MAKING WATCH BACKS AND BEZELS,

APPLICATION FILED 05030. 1913.

1 3%,257. Patented Nov. 7, 1916.

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GEORGE IE. EBERI-IARD, OF TEENTON, NEW JERSEY, ASSIGNOR T ROBT. H.INGERSOLL & 1330., A JOINT-STOCK ASSOCIATION ORGANIZED UNDER THE LAWS OFNEW YORK.

METHOD OF MAKING WATCH BACKS AND BEZELS.

Application filed December 30, 191.3.

T 0 all whom it may concern Be it known that I, GEORGE F. Ennnrmnn, acitizen of the United States, residing at Trenton, New Jersey, haveinvented certain new and useful Improvements in Methods of Making W'atchBacks and Bezels, of which the following is a specification.

My invention relates to a method for providing watch case backs orbezels with screw threads, at the inner side of their edges. 7

In the drawings Figure l is a sectional view of a blank which is to bethreaded; Fig. 2 shows this blank with its edge turned or curled in uponitself ready for the swaging operation; Fig. 3 represents a portion ofthe completed back or bezel; Fig. & is a top view of the machine; Fig. 5is an enlarged view of the threaded punch or head, with upsetting meansto engage the beaded or curled edge of the blank.

In carrying out my invention, 1 take a blank like that shown in Fig. 1,and with a beading machine of the ordinary type the edge of the blank iscurved or turned inwardly, as shown in Fig. 2. This blank is then placedin a die 6, Fig. 4, mounted on a shaft 7 journaled in suitable bearingsin a frame 8, and having a pulley 9 thereon by which the die may berotated. Opposite this die a punch or head 10 is located, having a screwthread at 11 of the pitch desired to be made in the edge of the blank.This head or punch is swiveled at 00 to and carried by a plunger whichmay be operated to and from the die by any suitable means; for instance,the toggle 12 operated by a handle 13 or by power in any desired way.The plunger carrying the punch or screw threaded head moves through abearing 14:, and it extends through a'slide 15 which has mounted thereonmeans for upsetting the beaded edge of the blank against the screwthreads of the punch or head. This means may assume various forms, andmay consist of devices disposed at diflerent points about thecircumference of the head, and in the particular form shown the saidmeans or devices consist of rollers 16 mounted on the slide 15, anysuitable form of bearings being provided for this purpose consisting inthe present instance of the arms 17 extending from the slide. Therollers are journaled to these arms, and they lie close adjacent theside of the punch or head 10, and

Specification of Letters Patent.

Patented Nov. *2, 1916.

Serial No. 809,556.

with their peripheries adjacent the base of the thread formed in theside of said punch or head. The slide may be advanced with the punch orhead by any suitable means. In the particular construction shown, thehandle or lever 18 is representative of any suitable connection or meansthat may be employed for advancing and retracting the slide with theupsetting means or devices attached thereto.

In the operation of the machine the die with the blank contained thereinis rotated, and the head or punch 10 is advanced so that the threadedportion of said head or punch will enter the blank and be locatedclosely adjacent to the inner side of the curled or beaded edge, theslide 15 will also be advanced, and its swaging rollers will engage thebeaded edge of the blank, and as the blank is turned by the revolutionof the die 6 all parts of this beaded edge will be acted upon by therolls or swaging elements of other forms that may be used, and thebeaded edge will therefore be upset or deformed and the metal thereofwill be flowed into the threads of the punch, it being understood thatduring this action the head 10 will turn with the die and blank all asone body. Upon retraction of the punch the cup-shaped back or bezel maybe turned off from the threaded punch. It will be understood that as thepunch, die and the swaging or upsetting means associated with the punchcome together, the metal of the beaded edge will be confined by theseparts, and the pressure resulting from the contact of the swagingelement or elements will cause the upsetting of the edge just described.

It will be understood that the invention is not limited to two rollersor swaging elements, as more or less upsetting elements may be employed.

By the use of my invention the escape of any of the metal from betweenthe die and punch is avoided, this surplus metal being known in the artas flash.

The machine may be operated by hydraulic pressure, compressed air orother power.

By my method the bead or curled edge of the blank is upset against thethreading punch or member by a progressive action due to the relativerotation of the female die and the swaging members.

After the swaging operation has been revolution of the die is reversedand the back or bezel is thereby unscrewed from the head or punch, andanother blank is inserted in the die and the operation repeated;

I claim as my invention l. The herein described process consisting inturning inwardly the edge portion of a cup-shaped member, holding saidmember in a cup-shaped die, operating a punch having a screw thread onits lateral face within the cup-shaped member and die and by pressureexerted progressively along the said turned edge and in a directionparallel with the aXis of the punch and die and across the holdingsurface of the die progressively upsetting the metal of the turned edgein a' direction transverse to the punching action and into said screwthreadson the lateral face of the punch substantially as described. 7 1

2. The herein described process of'screw threading a member having a rimconsisting in holding the member between a female die and a punch havingscrew threads, and then exerting pressure progressively, along the rimof the member so heldandin a direction parallel-with the aXis of thepunch and die and thereby upsetting the metal of the rim in adirectiontransverse.

to the punch axis and into said screw threads on the lateral face of thepunch, substantially as described;

In testimony whereof I aflix my signature in presence of two witnesses.V

GEO. F. EBERHARD. Witnesses:

CHARLES H. MARGERUM, JOHN BATES.

Copies of this patent may be obtained-for five cents each, byaddressingthe Commissioner of Patents,

Washington, I). 0.

